WETIEN液控單向閥MPCV節流閥MTCV減壓閥MBRV溢流閥MRV-02/03-W-P
液壓系統單向節流閥的結構及工作原理
單向節流閥由單向閥和節流閥并聯而成,用于一個方向需要控制流量而另一個方向(反向)需要油流暢通的回路中,以實現執行元件正向可調速,而反向能快速退回。
下面就帶大家來了解下單向節流閥的結構及其工作原理。
圖1所示爲滑閥壓差式單向節流閥。當油液從P1流向P2時,閥起節流閥作用,反向時起單向閥作用。閥芯4下端和上端分別受進、出油腔壓力油的作用,在進出油腔壓差和複位彈簧6的作用下,閥芯緊壓在調節螺釘2上,以保持原來調節好的節流口開度。
滑閥壓差式單向節流閥
圖2所示爲可以直接安裝在管路上的單向節流閥。節流口爲軸向三角槽式結構,旋轉調節套3,可以改變節流口通流面積的大小,實現流量調節。正向流動時(B→A)起節流閥作用;反向流動時(A→B)起單向閥作用,由于有部分油液可在環形縫隙中流動,可以清除節流口上的沉積物。閥芯左端有刻度槽,調節套上有刻度圈,以標志調節流量的大小。該閥流量調節須在無壓力下進行。博士力樂士系列的MK型單向節流閥即爲此結構。
管式單向節流閥
單向節流閥在結構上有兩種,一種是單向閥和節流閥共用一個閥芯,另一種是單向閥和節流閥兩個閥芯是分開的。如:中低壓單向節流閥(LI型),節流閥與單向閥共用一個閥芯,中高壓單向節流閥(LDF型)兩個閥芯是分開的,它們的壓力流量系列均同節流閥。它們的結構見圖3~圖5所示。
單向節流閥結構
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